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1. Energy
1.1 Energy changes in a System
1.1.12 Wasted Energy
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Created by
Oscar Fisher
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In practice, most systems tend to be
open
systems.
When energy transfers occur that are not useful, these are described as energy being
dissipated
to the
surroundings.
Dissipated
just means
spread out.
Often these less useful energy transfers involve
heating
,
light
and
sound.
When energy is transferred to the
thermal stores
of the objects, the temperature of the objects increases.
Visible light is
electromagnetic
radiation.
When sound is produced, the
sound waves
make the
air particles vibrate
as the wave carries
energy away.
Useful energy can be defined as: The energy that is
transferred
from
store
to
store
and used for an
intended
purpose.
Wasted energy can be defined as: The energy that is
not useful
for the
intended purpose
and is
dissipated
to the
surroundings.